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Smartphone Sensors and Android Overview

This document provides a comprehensive overview of smartphone sensors and their applications, particularly within the Android ecosystem. It covers key sensors including accelerometers, gyroscopes, magnetometers, light sensors, humidity sensors, touchscreens, barometers, microphones, and cameras. The roadmap also includes an introduction to Android architecture, accessing sensor data, and coding practices for mobile application programming. This resource is essential for developers looking to enhance their understanding of smartphone sensor technologies and their integration into Android applications.

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Smartphone Sensors and Android Overview

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  1. Smartphone Sensors and Android Overview CS/ECE 498 Ashutosh Dhekne (borrowed from Nirupam Roy)

  2. Roadmap • An overview of smartphone sensors and possible applications • Overview of Android architecture

  3. Smartphone Sensors • Accelerometer • Gyroscope • Magnetometer • Light sensor • Humidity sensor • Touch screen • Barometer • Microphone and Camera …

  4. Smartphone Sensors: Accelerometer

  5. Smartphone Sensors: Accelerometer

  6. Smartphone Sensors: Accelerometer

  7. Smartphone Sensors: Accelerometer

  8. Smartphone Sensors: Gyroscope

  9. Smartphone Sensors: Gyroscope

  10. Smartphone Sensors: Gyroscope

  11. Smartphone Sensors: Magnetometer

  12. Smartphone Sensors: Magnetometer

  13. Smartphone Sensors: Magnetometer

  14. Smartphone Sensors: Light Sensor

  15. Smartphone Sensors • Accelerometer • Gyroscope • Magnetometer • Light sensor • Humidity sensor • Touch screen • Barometer • Microphone and Camera …

  16. Smartphone Sensors: Fusion Sensor

  17. Smartphone Sensors: Fusion Sensor

  18. Smartphone Sensors: Fusion Sensor

  19. Any question on sensors?

  20. Android Architecture Your Mobile App

  21. Programming for Android

  22. Android Application Life-cycle

  23. Android Code to Access Sensor Data http://developer.android.com/guide/topics/sensors/sensors_overview.html privateSensorManager sensorManager;...sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);if (sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD) != null){// Success! There's a magnetometer.} else {// Failure! No magnetometer.}

  24. Android Code to Access Sensor Data publicclassSensorActivityextendsActivityimplementsSensorEventListener {privateSensorManagersensorManager;privateSensormLight;@OverridepublicfinalvoidonCreate(BundlesavedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);mLight = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);    }@OverridepublicfinalvoidonAccuracyChanged(Sensorsensor, int accuracy) {// Do something here if sensor accuracy changes.    }@OverridepublicfinalvoidonSensorChanged(SensorEvent event) {// The light sensor returns a single value.// Many sensors return 3 values, one for each axis.float lux = event.values[0];// Do something with this sensor value.    }@OverrideprotectedvoidonResume() {super.onResume();sensorManager.registerListener(this, mLight, SensorManager.SENSOR_DELAY_NORMAL);    }@OverrideprotectedvoidonPause() {super.onPause();sensorManager.unregisterListener(this);    }} Reading Values How often do you want updates?

  25. Android Code to Access Sensor Data Main Activity XML file Android Manifest file The main computing codes Code for organizing the UI The application meta-data Most of your code will be here Get all needed permissions

  26. Asking for Permissions • Reading or writing might need permissions from the user. <manifest ...><uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    ...</manifest> https://developer.android.com/training/data-storage/files#ExternalStoragePermissions

  27. Become a Developer http://www.imagezap.org/how-to-enable-developer-mode-on-android/

  28. Keep collecting data when not on your activity

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